CAJ | 학술논문

高压直流输电和地磁风暴均可引发变压器直流偏磁，这一现象会给变压器带来很多影响。而励磁电流的试验和分析是研究变压器直流偏磁特性的关键问题。通过直流偏磁下变压器励磁特性曲线，得出励磁电流表达式。对通过比较三相变压器组和三相铁心式变压器的铁心结构，得出三相变压器组更易受直流偏磁的影响。为了统一衡量变压器的直流偏磁的耐受能力，提出直流比置系数这一概念。并在不同直流比置系数条件下，利用PSCAD/EMTDC软件仿真出两种变压器励磁电流波形以及Ф-I曲线，通过仿真结果并验证了三相变压器组承受直流偏磁差这一特点。
고압직류수전화지자풍폭균가인발변압기직류편자，저일현상회급변압기대래흔다영향。이려자전류적시험화분석시연구변압기직류편자특성적관건문제。통과직류편자하변압기려자특성곡선，득출려자전류표체식。대통과비교삼상변압기조화삼상철심식변압기적철심결구，득출삼상변압기조경역수직류편자적영향。위료통일형량변압기적직류편자적내수능력，제출직류비치계수저일개념。병재불동직류비치계수조건하，이용PSCAD/EMTDC연건방진출량충변압기려자전류파형이급Ф-I곡선，통과방진결과병험증료삼상변압기조승수직류편자차저일특점。
High voltage direct current transmission (HVDC) and geomagnetic storms can lead to transformer DC magnetic bias, which give a lot of impacts on the transformer. The excitation current test and analysis are the key problems in studying of transformer DC magnetic bias characteristics. Through the transformer excitation characteristic curve under DC magnetic bias, the excitation current expression is derived. By comparing the core structure of the three-phase transformer group and the three-phase core-type transformers, the conclusion that the three-phase transformer group is more prone to DC magnetic bias influence is reached. In order to unify the measure of transformer DC bias tolerance, the concept of DC ratio opposed coefficient is put forward. Under different DC ratio opposed coefficient conditions, PSCAD/EMTDC software are used to simulate two types of transformers magnetizing current waveforms andФ-I curves. Simulation results verify poorer performance of the three-phase transformer group to bear DC magnetic bias.